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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de3a66c0bedde4c9e9b7ce5fc18bed239a69984f5e0989233ead533a80c52f77' 
  AND token = 'MKtCrCgnVPg3oUsaqVpKuFe8m9pIVmjK9iVmQ8XZSbk=' 
  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"
    }
  }
}