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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7808699415679e8f1a9a9a80491ea6031e70b6d6ff811b02927cabba76dc43db' 
  AND token = 'wlYuM0aAIrNwMSnAluv8B9106bb+EKGxfMF9jmq5Css=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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