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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd49c64576e9ccf4cf88a23e77b0266b496111ff7e86a1afb7cca19eb81c91ac' 
  AND token = 'ofZkS+3Whft3BjeYfZLHP3+cB0ACjYum0Pks5wAKCZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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