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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e04acb5d084764f97af4b6e3d453c87ba50ff0dde27c2e65a5941a5f0e2d2dd' 
  AND token = 'DVYDsegwJqzgQBE8Wn8gotrFFjFO/k+9/T5aq37bi54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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