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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '673eecc92fc0d35e40df954ed8f20efeb8e6019e6b4465d5095d1a1f0dfad3c8' 
  AND token = 'P6Sf+d+i/6EWwZE9MlXlmMxyzjBP+TQLJxvYUOj7/IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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