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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be8a8a47d556cfd6a8ec38f6ad4cafb69e68ae6a82218093f7236e68d358aafb' 
  AND token = 'O9WZs+dDSpkYtDSLrGctYX2KHf7MH5aK7Soubl6umU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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