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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2483346ddb19362ee1e80fdfaa43b99773df4866e267165f53ffb3434da7478' 
  AND token = 'gvrvoy3zCm8c7WCVkFFIPrmU8OII5Iy3Vxsl2oWcVCs=' 
  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"
    }
  }
}