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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d7139aa87214eb28e021caf497550ee5e1b4104fc5ce0f35afdc204de39988e' 
  AND token = 'eZzffqkdMmyym4NuweWJcDvASATdYIfBhdgILxpu2Mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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