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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b0ef147ec42e4d554f59ba39a6fa895c930c69d0904fbc7be8d56f93e0a47a' 
  AND token = 'VL4xM/fM4rBEfdCWYGSFBWPTb11FLrgWe74DL3+FytY=' 
  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"
    }
  }
}