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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b96c6007d2de22d529c7dadb9b500b2ec5c8df67d5aa194cc9fc041b2aaa4a32' 
  AND token = '07fGliWvV/CkLNkyvRQJQEhjyWjOZ9nm/h9n1YCSRGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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