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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba50b5b49188c443a9b6e45a3c29526ab3a9c3a23c9e7caf1deaeddd3afd6241' 
  AND token = 'eJ85P0E50Y1D66XMWI7KRR/7nz5dyggjPTk8Xe1JP4I=' 
  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"
    }
  }
}