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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6521e883af82d88952f582e8d2c49612f6581e58aa1157b6e8873089b037377' 
  AND token = 'aTP4i698X/N6Q8xOhUMsej8Tm8aaTQsi27pJM38g5HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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