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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc0f2ab31189b50ff09dc541e1a5655158cdfa98f2925fe59277fb1b3983cd4' 
  AND token = 'qyhcajLsnBrF+1ADrFcdnY7skNcsQOr5RUluL1PG2Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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