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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dd0a2c6a5ce6320a8361443c74d3cda99f3d73f70968f992d4034042f4dfb54' 
  AND token = '9Zlka1P8+O2z2W+qdgD/3aLIMVHHAPYkawSEtIr7i44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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