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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bfe4c38d548f2999a4a368a71c30c6a7ae8a73c6364229dc9b3326c24160e72' 
  AND token = 'c9kqSE1QJoJrw5cf3aXJuydcGuKCucdh1pdxp988zCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}