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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b30eb9b510ceb6a7d4dd064d879651b646ee4ac7cdcf09ba5f5348851940c7a' 
  AND token = 'cfV+gUkeiTFOxXVrqfjajQrh8rIb20MVntANcZlY+b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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