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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e14bd147e9018d1679aef9b1b1c237d7419ca0171c7844102bdbbbfa917dfcdf' 
  AND token = 'DmHLBmv35jO5Szu6+1Ma5JyKapUcRrBNNYXCDYVmi2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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