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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2faf6c01e34d0b27a43641bb86b7892bdfb1b0ae7941c50b58661f0c5609583a' 
  AND token = 'mS0PcVANL4Av3b1F/q4XfYEf7QZldGhfQ8jIYV4naM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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