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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebd91d45e2084e41c8563b1ad0eb256963445031dd4823e642c4d3c870c5c814' 
  AND token = 'BN/PQpO51bgGK3zofuVVxsX5+W9f2fSF2Nt6e0bfYhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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