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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e40abdfe8a1464f8ea0eac9172814108b64eda67b2b26c8af90e842e0a78c7ef' 
  AND token = 'AlNLUn4puZtaivJ6El7OqQN9iwrCmBH4/7s5hfRw1Fo=' 
  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"
    }
  }
}