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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97bf72134dbbd3b72b1ab16b6e7e8c717bc45e28172dabbbc27d1c620f5cac54' 
  AND token = 'wy/uv63VVV/rA6r8THcOKUINvx8nZXIAoBOOeDGVHUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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