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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '126aa925e556b00bb6f7f0ac897893abfbe683636bf5330cf916b686a72e445d' 
  AND token = 'b9J2LtAPj3ksYAb/ke5UB8qQfHyZ75Pj8RSM+nYSVtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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