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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb91ce4abac55008a29e5e0aadea0e98cbffed04d42ae1a01c4204590e3df30a' 
  AND token = 'lvxBX8id4PXKUhWNX2oRprMG5u/yVRZFRrG3sgp1+Z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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