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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3e940e78c658e0fb3d104c320e23586d1075d02185b3fa50afb75937d74c05' 
  AND token = 'PDgcfBZqSZINWjduQU7lYHfEWX5aik+J8inRWoQYWe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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