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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '555397d15a8c2c3ca3df4123d9cb1c29b8437f37fb890fcc306e9f9f2e079788' 
  AND token = 'J6kVJANoCcoGBP104S6onnlk+P+6fm7HyzpYkNNk6I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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