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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70253c82922189e9bfc0950c3cb64a4dc04e943bae4d7ac3f90594e1d0e534d7' 
  AND token = 'XRlgMxLnc9yTPpHPCjRgBlvLyT1+PTLrVNEvgc60Jak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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