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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e5b125c3a04a2813af74bcc260f92c5507a338e30f1abd6f1ce6b7d0b0de23' 
  AND token = 'F2WO1ZNn2Fla3CUm+kqsge4EfatowQvkoJwmS48E6jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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