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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2ee2a8c988ebee96da2e254f0032b2ff56879e8bf574d25f18d05b7a3c3a42b' 
  AND token = 'ht/0BEVb4HjCb2dv3HuMYjlF5EG3xKdUN2Ixyl/U5rk=' 
  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"
    }
  }
}