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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee9fafb66e3f1088053a57e7fc1964d14a0ef9f29eef3973ac563f561fb60c1c' 
  AND token = 'tTQYpM3CL3P+CTiUVAyVEIXLJ06KdbMf5F5i3EfzXJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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