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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b9e6c5727a0cfe4f0921839962e0fd443263e0cd53ce987df4aef2b10b907a6' 
  AND token = '/tC5nKHiAsV1MhUQlYQuj/0McetCwmh9bucoeFDC1k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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