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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fe8c681a4b41a60c0cca0aa36779c6e27e646220a7868800a3a0f9ed92023a2' 
  AND token = 'qYal4PpZJgr/sK+HL122yFne27xe8l+q+onYuZG0u8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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