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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '831641c4ae89233c1693bc7e34353ad0db5d32f8d3e82fd001571d58b5335184' 
  AND token = 'NCw+0mqg3uG0Ud+KvrAxHyZgI7+co3AlRfbcGzdNOQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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