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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '736420f1cc024ac1d062123fc1814d097cc601ecf3a2cf2be6d0d4b9662b33bd' 
  AND token = 'BBjtmrnGRR2vtj/1fqrJAHw0hg5+oX6HbLkerXD4UUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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