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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2a31fd44e0cdb48252bc0bae7d0098e9c2b58c8324da3a695ec58a051e9c05a' 
  AND token = 'C8sFjM4sqvy1Z2VGdJYEUE8/sNm42SFruH93jCgZCsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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