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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca4c040c67f19633c1fe1f102fd3397ec92bd12cfc1562027427d7775b5c9a22' 
  AND token = '2I+6UAKHvGQEOES1XRJnJu9tN4fnlmUpw1YGU6Affm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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