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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d0fd341e7b6976d26e80c4b087d725445e39d58af0a2a44216582484f53ac4' 
  AND token = 'oh3TRDnGSpkRZDKiNeJiuIuFopb5lpAgq4wRYVclEU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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