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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb4a478ac3be59a5ed4a1a540540b2121a96102da7deb5e29293fe7fc1c1751' 
  AND token = 'f2E5PBb6h+XL8gbwb8rM6taRylHdq2546Xfc7POGJFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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