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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa5216fc3a4010ea10ea5597d46d6901c9d3a1b333b649f32b0983210f40b094' 
  AND token = 'QR6bF1gqzgj5+QEGslZvMXno98v0mzK+3yU4SGsbrnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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