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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c586f7b71ae520bb73ef5ce1e822834bb3dd36ca0e7edc512433a013b1e6f4b9' 
  AND token = 'cwr9JI+mcCzuy21fIbQWIZ838k93aSJA+kBheS/jZ0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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