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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '112b0f364d4f97b09fb1070ed01d1d11037a96e3ac42582c9aff69bc36dddd1a' 
  AND token = '6W3c3eukgJpvreK3Ab2nB9/D6fZerGlBCmhXoMgKPUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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