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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d695a8041167c8af17e3b1bd9a17cd5a76abf30167401c722dcf1f9c3c10e17' 
  AND token = '4QVg3BA1uG4fh/TH+gMH2TXLskgD6KU3zR4K0fj7zKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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