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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24afb7e70d4a8ca1d85d7fa6c22474d01c2849cc9c5eb0ed035bdbccac4ffbab' 
  AND token = 'Y5j+UB/b/hUJ86PiMURfHLxKsnSi2+3F2hSE84/ghMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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