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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75483e00a6726eeb6f0768d0b63f59ac4d06811faf94b41d76ef845bbc9324fd' 
  AND token = 'jUOH2UejzKkhd4Ub15UOsic0NDfmIwyhnF5+cS/Qwww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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