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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad03fe18ea1a58d35a4fa2e0a0cdcff5fbddcb1b96d3529b7688320e04c3dc73' 
  AND token = 'Nb7O2pJuM5WtwZ9nPU3j/MSEFPEi965UcwATMuGsZLQ=' 
  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"
    }
  }
}